Adsorption of iron cyanide complexes onto clay minerals, manganese oxide, and soil

2010 ◽  
Vol 45 (11) ◽  
pp. 1391-1396 ◽  
Author(s):  
Dong-Hee Kang ◽  
A. Paul Schwab ◽  
C. T. Johnston ◽  
M. Katherine Banks
Keyword(s):  
Manganese Oxide ◽  
Clay Minerals ◽  
Iron Cyanide ◽  
Cyanide Complexes

scholarly journals Long-Term Release of Iron-Cyanide Complexes from the Soils of a Manufactured Gas Plant Site

2013 ◽  
Vol 04 (11) ◽  
pp. 8-19 ◽  
Author(s):  
Magdalena Sut ◽  
Thomas Fischer ◽  
Frank Repmann ◽  
Thomas Raab
Keyword(s):  
Iron Cyanide ◽  
Manufactured Gas Plant ◽  
Plant Site ◽  
Cyanide Complexes

Thermal study of some manganese oxide minerals

1950 ◽  
Vol 29 (210) ◽  
pp. 239-251 ◽  
Author(s):  
J. Laurence Kulp ◽  
Jose N. Perfetti
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Manganese Oxide ◽  
Clay Minerals ◽  
Iron Oxides ◽  
Theoretical Background ◽  
Thermal Study ◽  
The Past ◽  
Considerable Success ◽  
Oxide Minerals

In the past decade, differential thermal analysis has developed into a very useful mineralogical technique. The theoretical background for this method has been treated by Speil, Berkelhamer, Pask, and Da vies (1945) and has been modified by Kerr and Kulp (1948, 1949). The application of the method to the clay minerals has been carried out with considerable success by a number of workers in Europe and America. In particular, Grim and co-workers (1942, 1947, 1948) have produced a number of significant papers dealing with the thermal analysis of clays. The method has been extended to other mineral groups such as the carbonates (Faust, 1949; Beck, 1946; Kerr and Kulp, 1947; Cuthbert and Rowland, 1947; Kulp, Kent, and Kerr, 1950), phosphates (Manly, 1950), sulphates (Kulp and Adler, 1950), quartz (Faust, 1948), and the hydrous iron oxides (Kulp and Trites, 1950).

scholarly journals Mobility of Iron-Cyanide Complexes in a Humic Topsoil under Varying Redox Conditions

2009 ◽  
Vol 2009 ◽  
pp. 1-6
Author(s):  
Thilo Rennert ◽  
Tim Mansfeldt
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Redox Potential ◽  
Opposite Direction ◽  
Redox Conditions ◽  
Reductive Dissolution ◽  
Redox Processes ◽  
Iron Cyanide ◽  
Cyanide Complexes ◽  
Mn Oxides

The potentially toxic Fe-CN complexes ferricyanide,[FeIII(CN)6]3−, and ferrocyanide,[FeII(CN)6]4−, undergo a variety of redox processes in soil, which affect their mobility. We carried out microcosm experiments with suspensions of a humic topsoil (pH 5.3;Corg107 gkg-1) to which we added ferricyanide (20 mgl-1). We varied the redox potential (EH) from −280 to 580 mV by usingO2,N2and glucose. The decrease ofEHled to decreasing concentrations of Fe-CN complexes and partial reductive dissolution of (hydrous) Fe and Mn oxides. The dynamics of aqueous Fe-CN concentrations was characterized by decreasing concentrations when the pH rose and theEHdropped. We attribute these dependencies to adsorption on organic surfaces, for which such a pH/EHbehavior has been shown previously. Adsorption was reversible, because when the pH andEHchanged into the opposite direction, desorption occurred. This study demonstrates the possible impact of soil organic matter on the fate of Fe-CN complexes in soil.

scholarly journals FENOMENA TRANSPORT KOBALT-60 PADA LAPISAN TANAH

2013 ◽  
Vol 3 (1) ◽  
pp. 21
Author(s):  
Ngasifudin .
Keyword(s):  
Transport Phenomenon ◽  
Manganese Oxide ◽  
Clay Minerals ◽  
Concentration Profile ◽  
Maximum Concentration ◽  
Soil Column ◽  
Extraction Methods ◽  
Soil Component ◽  
Soil Components ◽  
Column Extraction

The transport phenomena of cobalt-60 (Co-60) in the soillayer has been investigated using column and batch methods. The association of Co-60 with soil and its components were studied by extraction methods. The concentration profile of Co-60 in the soil column was composed of two logarithmic curves that showing Co-60 would be consist of mobile and immobile fraction. The immobile fraction of Co-60 was adsorbed by soil and was distributed near in the top of column. Although the mobile Co-60 was little sorbed by soil and migrated through the soil column, themaximum concentration of Co-60 in the effluents decreased slightly with increasing length of the soil column. Extraction of Co-60 from the soil and from its components showed that Co-60 was sorbed by manganese oxide and clay minerals. Manganese oxide is one of the soil components that could be decrease the maximum concentration of Co-60 in the effluents. Although the content of manganese oxide in the soil was 0.24-0.29%, manganese oxide is the important component to preventthe migration of Co-60 in the low acidic solution.Keywords : Transport phenomenon, Cobalt-60, soil component Telah dilakukan penelitian tentang fenomena gerakan Kobalt-60 (Co-60) pada lapisan tanah yang dilakukan secara kolom dan batch. Penggabungan Co-60.dengan tanah dan komponennya dipelajari dengan serangkaian teknik ekstraksi. Gambaran konsentrasi Co- 60 di dalam kolom tanah tersusun oleh dua kurva logaritma yang menunjukkan Co-60 terdiri atas fraksi gerak dan tidak-gerak. Fraksi Co-60 tidak-gerak diserap oleh tanah dan didistribusikan di dekat bagian atas kolom. Meskipun Co-60 fraksi gerak hanya sedikit terserap oleh tanah dan di-transportkan melalui kolom tanah, konsentrasi maksimum Co- 60 di dalam efluen sedikit menurun dengan kenaikan panjang kolom tanah. Ekstraksi Co-60 dari tanah dan komponennya menunjukkan bahwa Co-60 diserap oleh mangan dioksida dan komponen lempung. Mangan oksida merupakan salah satu komponen tanah yang dapat menurunkan konsentrasi maksimum Co-60 di dalam efluen. Bahkan kandungan mangan oksida 0,24-0,29% dalam tanah menjadi komponen penting untukmencegah proses transport Co-60 pada larutan keasaman rendah.Kata kunci : Fenomena transport, Kobalt-60, komponen tanah 

X-RAY ABSORPTION EVIDENCE FOR THE BACK-DONATION IN IRON CYANIDE COMPLEXES

2002 ◽  
Vol 09 (01) ◽  
pp. 359-364 ◽  
Author(s):  
A. S. VINOGRADOV ◽  
A. B. PREOBRAJENSKI ◽  
S. A. KRASNIKOV ◽  
T. CHASSÉ ◽  
R. SZARGAN ◽  
...  
Keyword(s):  
Charge Transfer ◽  
High Resolution ◽  
Absorption Spectra ◽  
Spectral Characteristics ◽  
X Ray ◽  
Iron Cyanide ◽  
Cyanide Complexes ◽  
Cyanide Ligands ◽  
X Ray Absorption ◽  
Back Donation

High-resolution, uniformly calibrated Fe 2p 3/2 absorption spectra of various Fe(II) and Fe(III) compounds with the metal atom octahedrally coordinated to atomic and molecular ligands are analyzed expecting changes in the absorption spectra due to differences in the formal valence state and in the character of the chemical bond. Particular attention is given to revealing spectral characteristics of the 3d π–2π(π*) charge transfer (π-back-donation effect) between the iron atom and cyanide ligands.

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